Shifting aspect ratios for IMAX, can they not?

[Geoff D]

IMAX certainly do their own stuff, using the full 2048x1080 res (which is 1.90, or near as damn it) to do their bespoke open matte/alternating aspect digital presentations, but regular theaters have to make do with either 1.85 or 2.40 DCPs, so all other ratios have to fit inside one or the other. When Tarantino gets done with Hateful Eight I should imagine we'll get the 2.76 ratio letterboxed inside a 4K scope container, so it'll have an effective resolution of 4096x1480.